Handle for percussive ramming tools



HANDLE FOR PERCUSSIVE BAMMIG TOOLS May 18% 1926. 1,584,799

v R. F. PAGE HANDLE FOR PERcUsQsIvE RAMMING TOOLS l Wiz/( L HIS ATTOEY'@ Patented May 18, 1926.

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- ROBERT F. PAGE, DECEASED, LATE OF ATHENS, PENNSYLVANA; BY JOHN M.FELT, ADMINISTRATOR, OIE' ATHENS, PENNSYLVANIA, ASSGNOR TO'INGERSOLL-RANID COMPANY, OF JERSEY CITY, NEW JERSEY, A UORFORATON F NEWJERSEY.

HANDLE FOR EERCUSSIVE RAMMING TOOLS.

Application lerl October 5, 1925.

This invention relates to percussive ramming tools such as pneumaticsand rammers which may also be used for tamping concrete work ot allkinds 4or Jfor tamping earth 5 around gas or water mains, or forback-lilling other excavations in order to pack the dirt solidly andavoid any subsequent settlement. n

The objects of the invention are to 1mprove upon the handle constructionot such machines, secure a simple and efficient throt tle valvemechanism inthe handle operated by movement of a handle sleeve and alsoconstruct the handle and handle sleeve in such a manner that the shockof impact of the reciprocating tamping tool and the vibration arelargely absorbed in the handle which acts as a shock absorber.

Further objects ot the invention will hereinafter appear and theinvention is shown in one of its preferred forms in the accompanyingdrawings, in which- Figure 1 is a side elevation of a pneumatic rammerknown as afloor rammer or backfill tamper having an extension handle,the handle itself being broken away indicating that the machine 'isproportionately longer than indicated in the contines of the drawi ingsl Y 3() l Figure 2 1s an enlarged ylongitudinal sectional elevation ofthe handle portion oit' the machine partly broken away,

Figure 3 is Van enlarged detail vertical sectional view of the upperportion ot Figure 2 showing the throttle or supply valve in openposition, v l

Figure e is a view similar to Figure 3 partly broken away taken at rightangles to Figure 3 and showing the valve closed,

Figure 5 is an enlarged detail longitudinal sectional elevation of thepercussive element of the machine partlyI7 broken away to which elementthe handle rod is adapted to be secured, and y Figure' ,6v isatransverse sectional view of Figure 5 onf the line 6 6 looking in thedirection of the arrows.

.Referring tothe drawings, the machine comprises a percussive elementindicated gen- 5@ erally by the reference character A` in Fig* ures 1and 5 and a handle element indicated by the reference character-B inFigures l and 2which two elements are suitably secured together by anysuitable connection Serial No. 60,633.

at the point C in Figure 1, in this instance a screw threaded connectionbeing indicated. Material to be tamped, suchy as sand D, is operatedupon by the butt E or other suitable implement adapted to be'connectedto the piston rod F having the piston G reciprocated in the cylinder Hand controlled by a distributing valve J.

ln accordance `with this improved construction the cylinder H isprovided with front and back cylinder casings K and L and the valve J islocated in a valve chamber O formed between the opposed ends P and Q, orthe cylinder casings. The valve is in the form of a sleevesurroundingwthe cylinder H and aspacing sleeve 'R between the ends ofthe cylinder casings conveniently forms oneJ wall of the valve chamber.Suitable means are provided for holding the cylinder casings togetherand in this instance flanges S and T are provided onl the casings and anouter casing U extends over said cylinder casings and bears againsttheflange S. A nut V is adapted to engage the opposite end of the outercasing U and bear against i the flange T of the back cylinder casingfirmly clamping the parts together.

Thefcylinder H is provided with a Lfront cylinder packing Washer W heldin position by the front cylinder casing K and packing X for the pistonrod F is held in the front portion of the Jfront cylinder portion K by`means 'of a packing bushing Y which is held in placey by the screwthreaded cap Z and lock nut a. The back head of the cylinder H is formedby the back head plug Z) which in this instance is held in position bythe shoulder c of the back cylinder casing L.

rlhis back cylinder casing L has a` reduced hollow extension clcontaining a strainer e suitably connected to the back cylinder plug andan oil plug;E is provided on this reduced extension 6l. e

The cylinder H is provided with a piston lcontrolled, exhaust port gcommunicating through the front cylinder casing K with the exhaust port7L in the outer casing U. Cylinder ports j and la communicate with theends of the cylinder andpassages o and p between the cylinder andcasings and preferably formed on the outside of the cylinderconnectthese ports with the valve chamber. Another passage g connectsthe hollowback head plug Z9 with .the valve chamber through the agency of the port7 in the baclr cylinder casingand the passage S between the outer casingU and the spacing sleeve R. The back head plugv b is formed, as shown,with the inlet ports t and pressure fluid is supplied through the hollowhandle rod u and hollow reduced extension (Z of the back cylinder casingL to the port t and from thence through the passage g, port r, passages, and through the ports lv in the spacing sleeve It to the interior ofthe valve J. lVith the parts in the position shown in Figure 5, theforward end of the valve is opened tc atmosphere through the passage pand through the interior of the cylinder to the exhaust port L so thatlive pressure fluid in the valve moves the valve to its forwardposition. Pressure fluid is permitted to pass through the rearward valveopenings w to the passage o and thence through the port j to therearward end of the cylinder to drive the piston forward. After thepiston G has passed and uncovered the exhaust port g in its forwardtravel, the rearward end of the valve will be subject to atmosphericpressure and the valve will be thrown rearwardly so that pressure fluidwill pass through the valve openings and thence through the passage 7)and port 7c to the foward end of the cylinder to return the piston onits rearward stroke, after which the cycle is repeat-ed. The valve .I islight and simple in construction and has a short travel of sullicientlength, however, to supply the full amount of pressure fluid needed foroperating the tamperl piston and tamper tool.

In the present instance, an extension handle is shown comprising thehollow handle rod u and the operative parts connected for controllingthe supply of' pressure fluid into the machine and for taking up theshock in the machine which would otherwise be transmitted to the handsand arms of the operator. In Figure 1 the extension handle rod is shownbroken away and in Figure 2 the detail of the handle construction isillustrated. Upon the reduced portion g/ of the handle rod is suitablysecured a handle head block a as by mea-ns of a screw threadedconnection 3. A throttle valve 4 forming the supply valve is normallyclosed upon the seat 5 in the head block z and spring pressed by meansof the spring' 6 held in position by the retaining nut 7 which alsoforms a supply connection of pressure fluid to the machine. The stem 8of the valve is guided in the head block and this 'valve controls thesupply port 9 communieating with the passage 10 in the head blockleading to the hollow bore 12 of the extension handle u.

The lower end of the valve stem S, as shown, rests upon a movable valveblock 13 normally resting upon the stationary valve the head blockrss-1799 block 14 both contained within a slot or opening 15 in the headblock These two valve blocks are formed with bevelled or wedged shapedportions 16 with which wedges, operating devices or balls 17 cooperateadapted. to force the upper block 13 away from the lower block as theballs are pressed inwardly. For this purliose a valve actuating sleeve18 is slidahly mounted outside the head block s and is provided with thebevelled portions 19 which fcrce the balls 17 inwardly as the actuatingsleeve 1S is forced forwardly as indicated in Figures Q and 3. Ashoulder 20 on the head block forms a stop cooperating with the shoulder21 on the sleeve for limiting the movement of the sleeve in a forwarddirection. A flange Q2 on the nut 7 limits the movement of the sleeve ina rearward direction.

The sleeve 18 is adapted to he actuated by means of a handle sleeve i223extending over and partially over the hollow handle rod u. The handlesleeve 22) is connected to the valve actuating`- sleeve 1S as by meansof the cap nut 24 into which the upper end of the valve actuating sleeveis suitably secured. i

A spring bears at its forward end upon a shoulder 26 of the hollowhandle rod 'u and at its upper end bears against a washer 27 securedagainst the internal shoulder 9S of the handle sleeve so that when thehandle sleeve is moved forward to open the supply valve 4, the spring 25is placed under compression and upon releasing this coinpressicn, thehandle sleeve is reduced to its rearmost position to permit the valve 4to close upon its seat 5 under the influence of the spring 6.

In the operation of the device, the supply valve 4 is opened by slidingthe handle sleeve 23 forwardly on the hollow handle rod u which carriesthe valve actuating sleeve 18 forwardly and the halls 17 are forcedbetween the wedge shaped portions of the valve blocks to move therearward valve block rearwardly and open the valve 4. Pressure fluid isthen supplied down through the passages 10 in the head block z andthrough the hollow7 handle rod u to the back head block or plug Z1 ofthe percussive element which start-s the reciprocation of the piston Gand tamper tool E for tamping purposes. The reciprocation of the pistonis stopped by releasing or moving the slidable handle sleeve 23rearwardly to permit the supply valve 4 to close.

I claim:

1. In a fluid actuated percussive ramming tool, the combination of apercussive element, a rearwardly extending handle rod, a handle headblock, a normally closed spring pressed valve in said head block, asliding valve actuating sleeve over said head block, an outer slidablehandle sleeve engaging said valve actuating sleeve and extendingpartially over the handle r-od, and a spring between the handle rod andhandle sleeve, wher-eby the valve may be actuated by movement of thehandle sleeve and the shock of the percussive element is partiallyabsorbed by said handle spring.

2. In a fluid actuated percussive ramming tool, the combination of apercussive element, a rearwardly extending handle rod, a handle headblock, a normally closed Spring pressed valve in sai-d head block, amovable valve block forming an ab-utment for the valve, a y slidingvalve actuating sleeve over said head block, a movable member interposedbetween the valve block and sliding sleeve and cooperating with both, anouter slidable handle sleeve engaging said valve actuating sleeve andextending partially over the handle rod, and .a spring between lthehandle rod and handle sleeve, whereby the valve may be actuated bymovement of the handle sleeve and the shock of the percussive element ispartially absorb-ed by said handle spring.

3. In a fluid actuated percussive ramming tool, the combination of apercussive element, a rearwardly extending handle rod, a handle headblock, a normally closed spring pressed valve in said head block, twoWedge shaped valve blocks, one being movable .and forming an abutmentfor the valve, a sliding valve actuating sleeve over said head block,wedge separating members interposed between said valve blocks and thesliding sleeve and cooperating with said valve blocks and with the saidsliding sleeve, an outer slidable handle sleeve engaging said valveactuating sleeve and extending partially over the handle rod, and aspring between the handle rod and handle sleeve, whereby the valve maybe actuated by movement of the handle sleeve and the .shock of thepercussive element is partially absorbed by sai-d handle spring.

4f. In a fluid actuated p-ercussive rammng tool, the combination of apercussive element, a rearwardly extending handle rod, a handle headblock, a normally closed spring pressed valve in said head block, twoopposed wedge shaped valve blocks, one being movable and forming anabutment for the valve, a slidingvalve actuating sleeve over said headblock having beveled portions, balls interposed between said valveblocks and the beveled portions of the said sliding sleeve whereby theballs are adapt-ed to be forced inwardly by the sliding sleeve toseparate the valve blocks, an outer slidable handle sleeve engaging saidvalve actuating sleeve and extending partially over the handle rod, anda spring between the handlevrod .and handle sleeve, whereby the valvemay be actuated by movement of the handle sleeve and the shock of th-epercussive element is partially absorbed by said handle spring.

In testimony whereof I have Signed this specification, as administrator.

JOHN M. FELT,

Sole Administrator of the Estate of Robert F. Page, Deceased.

